[U-Boot] tpm: don't use unneeded double brackets

[Tom Rini]

On Wed, Jun 18, 2014 at 10:59:48PM +0200, Jeroen Hofstee wrote:

> clang is tempted to inteprete such a condition as a assignment
> as well. Since it isn't don't use double brackets.
> 
> cc: Tom Wai-Hong Tam <waihong at chromium.org>
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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